WARNING: PERSONNEL MUST STAY CLEAR OF THRUST REVERSER WHEN IT IS ACTUATED TO PREVENT BEING CAUGHT BY ROTATING DEFLECTOR DOORS.
(2)
Deactivate thrust reverser hydraulic system by installing ground locks at both thrust reverser isolation valves.
WARNING: SERIOUS INJURY CAN RESULT TO PERSONNEL IF GROUND LOCKS ARE NOT PROPERLY INSTALLED. ATTEMPT TO RETURN THRUST REVERSERS TO FORWARD THRUST AFTER INSTALLING GROUND LOCKS. REVERSERS MUST NOT MOVE HYDRAULICALLY.
(3)
Check that battery bus, dc bus No. 1 and bus No. 2 are energized.
(4)
Check that the following circuit breakers on circuit breaker panel P6 are closed:
(a)
ENG 1 thrust reverser
(b)
ENG 2 thrust reverser
(c)
MASTER CAUTION (2 places)
(d)
DIM AND TEST
500
May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 78-36-01 Page 501
(e) INDICATOR (9 places) D Test Position Indicating System
(1)
Check that both REVERSER UNLOCKED lights are on. If lights are not on, press to test bulb and check circuit breakers.
(2)
Manually depress both latch blocking arms on engine No. 1 and check that engine No. 1 REVERSER UNLOCKED light goes out.
(3)
Release latch blocking arms one at a time. Engine No. 1 REVERSER UNLOCKED light should come on when either blocking arm is released even though the other remains depressed.
NOTE: If light response is not correct in step (2) or (3), test sensors and switch cards as follows:
(a)
Check that gap between sensor and latch arm does not exceed 0.090 inch with latch depressed. Adjust sensor per 78-36-12 R/I.
(b)
Disconnect proximity sensor wiring harness electrical connector at forward side of thrust reverser shroud bulkhead (Ref 78-36-12 R/I).
(c)
Measure resistance between pins 1 and 3 and between 2 and 3 of sensor harness connector to check circuit through upper door lock sensor and sensor wires. Measure resistance between pins 4 and 6 and between 5 and 6 to check circuit through lower door lock sensor. See Fig. 501 for resistance values.
NOTE: If these resistance values are outside the limits shown, the sensor should be removed from the airplane and a shop test performed to determine if sensor is serviceable.
(d)
Replace proximity sensor, if defective, per 78-36-12 R/I. If sensors are not defective, replace the M528 Engine Accessory Unit Module (Ref 78-34-91).
(e)
Reconnect electrical connector at thrust reverser shroud bulkhead.
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78-36-01 Page 502 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 01/95
(4) Repeat steps (2) and (3) for engine No. 2.
E. Restore Airplane to Normal
(1)
Reactivate thrust reverser hydraulic system by removing ground locks from both thrust reverser isolation valves.
WARNING: PERSONNEL MUST STAY CLEAR OF THRUST REVERSER WHEN IT IS ACTUATED TO PREVENT BEING CAUGHT BY ROTATING DEFLECTOR DOORS.
(2)
Return thrust reverser to forward thrust position.
H30093
500 Proximity Sensor Resistance Checkout
Aug 15/72 Figure 501 78-36-01
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Isolation Valve Indicating System Test
A. General
(1) This test provides a check of the pressure switches installed downstream of each isolation valve that operate in parallel to control the single indicator light. The test will confirm that both switches are operating or will isolate a fault to one of the two switches. The test is performed by monitoring indicator light response while operating one thrust reverser at a time.
B. Equipment and Materials
(1) Thrust Reverser Isolation Valve Ground Lock Cap and Pin Assembly - F80109-3 or F80109-9 or equivalent
C. Prepare for Test
(1)
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